PM not expecting changes to budget plan

Prime Minister Scott Morrison doesn't expect any change to the government's plans to bring the budget back to balance by 2019/20, followed by a more hefty surplus the following year.

His comments come after the final budget outcome for 2017/18 released on Tuesday showed the government delivered the smallest deficit in a decade, on the back of a bigger tax take and growing economy.

The development prompted speculation the budget could be returned to surplus earlier than planned.

But Mr Morrison expects the government's existing plans will be upheld in its mid-year economic and fiscal outlook to be released in December.

"I don't think there's any reason at this point to suggest that there would be any change to that trajectory," he told ABC Radio on Wednesday.

The prime minister has also confirmed his successor as treasurer, Josh Frydenberg, will be sticking to the government's rule that it can't introduce any new spending without offsetting it with savings.